signalapp/libsignal
Home to the Signal Protocol as well as other cryptographic primitives which make Signal possible.
Build with Backblaze B2
SDKs, agent skills, IDE extensions, and reference pipelines from Backblaze Labs. All open source.
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Where it stands
Rank, growth pace and release cadence relative to everything GStars tracks.
5 releases in the last 90 days, the latest 2 days ago, with 62 contributors on GitHub.
Peaked at #40 in the weekly ranking the week of Mar 8, its best in the past year.
Use Cases & Benefits
- Implements the Signal Protocol and cryptographic primitives in Rust for secure messaging and device features.
- Provides platform-agnostic, high-assurance cryptographic APIs used by official Signal clients and servers.
- Use for integrating end-to-end encrypted messaging with the Double Ratchet algorithm in mobile or desktop apps.
- Use for implementing zero-knowledge proofs and private group systems based on Signal's cryptographic research.
- Use for building secure device-to-device data transfer and account key recovery features in privacy-focused applications.
Should you depend on it?
License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.
License
AGPL 3.0
Network copyleft: like the GPL, and also triggered by offering the software over a network.
Community files
- README: present
Watch-outs
- AGPL-style copyleft also applies when the software is offered over a network.
General guidance from repository metadata, not legal advice. How we score
From the README
libsignal contains platform-agnostic APIs used by the official Signal clients and servers, exposed as a Java, Swift, or TypeScript library. The underlying implementations are written in Rust:
This repository is used by the Signal client apps (Android, iOS, and Desktop) as well as server-side. Use outside of Signal is unsupported. In particular, the products of this repository are the Java, Swift, and TypeScript libraries that wrap the underlying Rust implementations. All APIs and implementations are subject to change without notice, as are the JNI, C, and Node add-on "bridge" layers. However, backwards-incompatible changes to the Java, Swift, TypeScript, and non-bridge Rust APIs will be reflected in the version number on a best-effort basis, including increases to the minimum supported tools versions.
To build anything in this repository you must have Rust installed, as well as Clang, libclang, CMake, Make, protoc, and git.
Daily snapshots
Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots
Forks
805+45
Open issues
24+7
Compared with peers in Backend
Fastest-growing repositories GStars tracks in this cohort for the week of Nov 1, by 7-day star growth
| Repository | Stars | +7d | Health | Last release |
|---|---|---|---|---|
| anthropics/skills | 187.8K | +2.9K | 15 | — |
| DuarteSantos8/openGym | 19.7K | +2.4K | 60 | 2 days ago |
| shiyu-coder/Kronos | 47.0K | +2.3K | 16 | — |
| NationalSecurityAgency/ghidra | 98.2K | +2.3K | 64 | 14 days ago |
| microsoft/VibeVoice | 56.0K | +1.1K | 29 | — |
| signalapp/libsignal | 6.1K | — | 55 | 2 days ago |
| Category median | 56.0K | +2.3K | 29 | — |
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